//测试学习封装





public class Computer {
    private String cpu;
    private String memory;
    public String screen;
    String brand; //default 属性

    public Computer(String cpu, String memory, String screen, String brand) {
        this.cpu = cpu;
        this.memory = memory;
        this.screen = screen;
        this.brand = brand;
    }
    public void Boot(){
        System.out.println("开机");
    }
    public void PowerOff(){
        System.out.println("关机");
    }
    public void SurfInternet(){
        System.out.println("上网");
    }
}
